ASTM_D_6878_-_D_6878M_-_21.pdf

Designation:D6878/D6878M21Standard Specification forThermoplastic Polyolefin-Based Sheet Roofing1This standard is issued under the fixed designation D6878/D6878M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers flexible sheet made fromthermoplastic polyolefin(TPO)as the principal polymer,intended for use in single-ply roofing membranes exposed tothe weather.The sheet shall contain reinforcing fabrics orscrims.1.2 The tests and property limits used to characterize thesheet are values intended to ensure minimum quality for theintended purpose.In-place roof system design criteria,such asfire resistance,field seaming strength,material compatibility,and uplift resistance,among others,are factors which should beconsidered but are beyond the scope of this specification.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the standard.1.4 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety,health,and environmental prac-tices and determine the applicability of regulatory require-ments prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D471 Test Method for Rubber PropertyEffect of LiquidsD573 Test Method for RubberDeterioration in an AirOvenD751 Test Methods for Coated FabricsD1149 Test Methods for Rubber DeteriorationCracking inan Ozone Controlled EnvironmentD1204 Test Method for Linear Dimensional Changes ofNonrigid Thermoplastic Sheeting or Film at ElevatedTemperatureD2137 Test Methods for Rubber PropertyBrittleness Pointof Flexible Polymers and Coated FabricsD5538 PracticeforThermoplasticElastomersTerminology and AbbreviationsD7635/D7635M Test Method for Measurement of Thicknessof Coatings Over Fabric ReinforcementG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG155 Practice for Operating XenonArc LampApparatus forExposure of Materials3.Materials and Manufacture3.1 The sheet shall be formulated from ethylene and higheralpha-olefin polymers,copolymers,and mixtures thereof,inamounts greater than 50%by weight of the total polymercontent,suitably compounded to satisfy the physical require-ments in the specification(see Practice D5538).3.2 The sheet shall be capable of being heat welded,fused,or adhesively bonded to itself for making watertight fieldsplices and repairs,and the supplier or fabricator shall recom-mend suitable methods and materials.3.3 Sheet shall be reinforced with fabric or scrim.1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.18on Nonbituminous Organic Roof Coverings.Current edition approved Nov.1,2021.Published November 2021.Originallyapproved in 2003.Last previous edition approved in 2019 as D6878/D6878M 19.DOI:10.1520/D6878_D6878M-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.Physical Properties and Tolerances4.1 Each sheet specimen shall meet or exceed the physicalrequirements prescribed in Table 1.4.2 The tolerance for time conditions(aging,weathering,and so forth)is 615 min or 61%of the period,whichever isgreater,unless otherwise specified.4.3 The tolerance for temperature conditions(aging,weathering,and so forth)is 62 C 64 F of the specifiedtemperature,unless otherwise specified.5.Dimensions and Permissible Variations5.1 The width and length of the sheet shall be agreed uponbetween the purchaser and t